Add astra client module (#140)

* Add astra client module

* Add astra client module

* Add astra client module

* Add astra client module

* Add astra client module

esd_services_api_client/nexus/modules/__init__.py

@@ -17,4 +17,8 @@
  Import index.
 """
 
-from esd_services_api_client.nexus.modules.mlflow_module import MlflowModule
+try:
+    from esd_services_api_client.nexus.modules.mlflow_module import MlflowModule
+except ModuleNotFoundError:
+    pass
+from esd_services_api_client.nexus.modules.astra_client_module import AstraClientModule

esd_services_api_client/nexus/modules/astra_client_module.py

@@ -0,0 +1,63 @@
+#  Copyright (c) 2023-2024. ECCO Sneaks & Data
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+
+"""
+Astra Client module that provides the astra client to the Nexus framework.
+"""
+
+import os
+from typing import final
+
+from adapta.storage.distributed_object_store import AstraClient
+from injector import Module, singleton, provider
+
+from esd_services_api_client.nexus.exceptions.startup_error import (
+    FatalStartupConfigurationError,
+)
+
+
+@final
+class AstraClientModule(Module):
+    """
+    Astra Client module.
+    """
+
+    @singleton
+    @provider
+    def provide(self) -> AstraClient:
+        """
+        DI factory method.
+        """
+
+        required_env_vars = [
+            "NEXUS__ALGORITHM_NAME",
+            "NEXUS__ASTRA_KEYSPACE",
+            "NEXUS__ASTRA_BUNDLE_BYTES",
+            "NEXUS__ASTRA_CLIENT_ID",
+            "NEXUS__ASTRA_CLIENT_SECRET",
+        ]
+
+        if all(map(lambda v: v in os.environ, required_env_vars)):
+            return AstraClient(
+                client_name=os.getenv("NEXUS__ALGORITHM_NAME"),
+                keyspace=os.getenv("NEXUS__ASTRA_KEYSPACE"),
+                secure_connect_bundle_bytes=os.getenv("NEXUS__ASTRA_BUNDLE_BYTES"),
+                client_id=os.getenv("NEXUS__ASTRA_CLIENT_ID"),
+                client_secret=os.getenv("NEXUS__ASTRA_CLIENT_SECRET"),
+            )
+
+        raise FatalStartupConfigurationError(
+            f"Astra client requires these environment variables: {required_env_vars}"
+        )